Chillicothe, Illinois Weather
Cicadas claim the scorching afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Chillicothe weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Drizzle64%0.05″85°68°—
- SundayJul 5Overcast16%—83°68°-2°
- MondayJul 6Overcast10%—81°65°-2°
- TuesdayJul 7Overcast——80°59°-1°
- WednesdayJul 8Light Drizzle——84°64°+4°
- ThursdayJul 9Thunderstorm48%0.31″82°70°-2°
- FridayJul 10Overcast48%—78°64°-4°
AQI 27 (Good), driven by PM2.5. AQI down 5 over the last 6 hours (gradual decline). PM2.5 at 8.8 µg/m³, PM10 at 9.9 µg/m³ — typical background levels with no transport signature.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion during the projected peak around 10 PM.
What's driving it
Ozone × UV × Sky
Ozone at AQI 33 now. With UV 3.5 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 11 around 1 PM.
- Present
- AQI 33
- UV peak
- 3.5 at 1 PM
- Sky at peak
- partly cloudy
- Projected peak
- AQI 11
PM × Wind × Precip
PM2.5 at 8.8 µg/m³, PM10 at 9.9 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.89
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- background
Trends
Seven days of AQI and PM2.5.
Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
- Moonrise
- 10:54 PM
- Moonset
- 10:03 AM
- In sign
- ♓︎ Pisces
Cicadas claim the scorching afternoon
Chillicothe at a glance
- Today vs. normal: 10°F above the seasonal normal for this latitude
- Last frost: April 21 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 61523
16-Day Forecast — Chillicothe
- Sat85°68°64%
- Sun83°68°16%
- Mon81°65°10%
- Tue80°59°2%
- Wed84°64°9%
- Thu82°70°48%
- Fri78°64°48%
- Sat83°65°14%
- Sun69°60°7%
- Mon74°57°10%
- Tue75°61°10%
- Wed78°63°16%
- Thu82°65°19%
- Fri83°70°26%
- Sat86°70°29%
- Sun85°72°32%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of July 4, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.
SPC Convective Outlook
Storm Prediction Center — Chillicothe
SPC has placed Chillicothe in the Slight Risk category for severe thunderstorms today.
- TODAYSLGTSlight Risk
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3TSTMGeneral Thunderstorms
Scattered severe storms possible. A few tornadoes, hail, and damaging wind gusts possible.
Source: NOAA / NWS Storm Prediction Center categorical convective outlook. Outlooks are re-issued multiple times per day; this page reflects the most recent SPC polygons covering the city’s coordinates.
ZIP codes in Chillicothe
- 61523